21-5n=-(3n-7)

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Solution for 21-5n=-(3n-7) equation:


Simplifying
21 + -5n = -1(3n + -7)

Reorder the terms:
21 + -5n = -1(-7 + 3n)
21 + -5n = (-7 * -1 + 3n * -1)
21 + -5n = (7 + -3n)

Solving
21 + -5n = 7 + -3n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '3n' to each side of the equation.
21 + -5n + 3n = 7 + -3n + 3n

Combine like terms: -5n + 3n = -2n
21 + -2n = 7 + -3n + 3n

Combine like terms: -3n + 3n = 0
21 + -2n = 7 + 0
21 + -2n = 7

Add '-21' to each side of the equation.
21 + -21 + -2n = 7 + -21

Combine like terms: 21 + -21 = 0
0 + -2n = 7 + -21
-2n = 7 + -21

Combine like terms: 7 + -21 = -14
-2n = -14

Divide each side by '-2'.
n = 7

Simplifying
n = 7

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